Grok STT API reference

Call Grok STT from your own code with one PopNow API key. Below are the exact model IDs to send, every input field the model accepts, what each request costs in credits, and a request you can paste into a terminal.

At a glance

Made by: xAI
Output: Audio
From: 0.01 credits per second of output ($0.0001)
Typical time: about 7 s
Model IDs: xai/grok-stt/speech-to-text

1 credit = $0.01. A task holds the highest possible charge when it is accepted and settles the real amount when it finishes, rounded up to whole credits; failed tasks are not charged. Ask POST /api/v1/jobs/quote for the exact figure before you run.

Speech to Text

xai/grok-stt/speech-to-text

Price

Option	Credits (per second of output)	US dollars
`Default`	0.01	$0.0001

Parameters

Field	Type	Default	Allowed	What it does
`audio_url`Required	`string (uri)`	—	—	Audio to transcribe: an uploaded MP3 or WAV, or a public URL to a common audio or video format. 1 second to 2 hours.
`language`Optional	`string`	—	ar, cs, da, nl, en, fil, fr, de, hi, id, it, ja, ko, mk, … (+11)	Spoken language. Leave empty to detect it; required when text_normalization is on.
`text_normalization`Optional	`boolean`	`false`	—	Write spoken numbers, prices, dates and units in digits. Needs language.
`keyterms`Optional	`array<object>`	`[]`	up to 100 items	Names and terms to spell the way you list them, up to 100.
`filler_words`Optional	`boolean`	`false`	—	Keep filler words such as um and uh in the transcript.
`multichannel`Optional	`boolean`	`false`	—	Transcribe each channel separately, one line per channel. Turn on when speakers are on separate channels.

Example request

This request runs as it is; any field you leave out uses its default. Put your key in POPNOW_API_KEY first.

The example uses PopNow sample files in audio_url. Replace them with your own public HTTPS links, uploads or saved assets.

POST /api/v1/jobs/createTask?wait=60

curl -X POST "https://api.popnow.ai/api/v1/jobs/createTask?wait=60" \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "model": "xai/grok-stt/speech-to-text",
  "input": {
    "audio_url": "https://media.popnow.ai/shortfilm/voices/Aoede-46e4c427.mp3"
  }
}'

The response carries a taskId straight away. Read the result with GET /api/v1/jobs/recordInfo, or add callBackUrl to be notified.

GET /api/v1/jobs/recordInfo

curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=TASK_ID_FROM_CREATE_TASK" \
  -H "Authorization: Bearer $POPNOW_API_KEY"